-- @testpoint: opengauss关键字first(非保留)，作为函数名，部分测试点合理报错

--关键字不带引号-成功
drop function if exists first(i integer);
create function first(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists first(i integer);
--关键字带双引号-成功
drop function if exists "first"(i integer);
create function "first"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists "first"(i integer);
--关键字带单引号-合理报错
drop function if exists 'first';
create function 'first'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `first`;
create function `first`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/